<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>用户管理</el-breadcrumb-item>
      <el-breadcrumb-item>用户列表</el-breadcrumb-item> 
    </el-breadcrumb>

     <!-- 卡片视图区域 -->
      <el-card>
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="rolelist" border stripe>

         <!-- 展开列 --> 
        <el-table-column type="expand">
            <template slot-scope="scope">
                <el-row  :class="['bdbottom', i1 === 0 ? 'bdtop' : '','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
                 <!-- 渲染一级权限 --> 
                  <el-col :span="5"> 
                    <el-tag closable @close="removeRightById(scope.row,item1.id)" >{{item1.authName}}</el-tag>
                     <i class="el-icon-caret-right"></i> 
                  </el-col>
                   <!-- 渲染二级和三级权限 --> 
                  <el-col :span="19"> 
                      <!-- 渲染二级--> 
                      <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                         <el-col :span="6">
                            <el-tag closable @close="removeRightById(scope.row,item2.id)"  type="success">{{item2.authName}}</el-tag>
                             <i class="el-icon-caret-right"></i>
                         </el-col>
                          <el-col :span="18">
                           <!-- 渲染三级权限--> 
                             <el-tag closable @close="removeRightById(scope.row,item3.id)" type="warning" v-for="(item3,i3) in item2.children" :key="item3.id">{{item3.authName}}</el-tag>
                          </el-col>
                      </el-row>
                  
                   </el-col>

                </el-row>
            </template>
        </el-table-column>
         <!-- 索引列 --> 
          <el-table-column type="index"></el-table-column>
          <el-table-column label="角色名称" prop="roleName"></el-table-column>
          <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
          <el-table-column label="操作" width="300px">
            <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
            </template>
          </el-table-column>
      </el-table>

      </el-card>


      
      <!-- 分配权限的对话框 --> 
      <el-dialog
          title="分配权限"
          :visible.sync="setRightDialogVisible"
          width="50%"
          @close="setRightDialogClosed">
        
          <!-- 树形控件 --> 
          <el-tree 
            :data="rightslist" 
            :props="treeProps" 
           show-checkbox
           node-key="id"
           default-expand-all
           :default-checked-keys="defkeys"
           ref="treeRef"></el-tree>

          <span slot="footer" class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="allotRights">确 定</el-button>
          </span>
        </el-dialog>



  </div>
</template>

<script>
export default {
  data(){
    return {
      //所有角色列表
      rolelist:[],
      // 控制 分配权限对话框的显示与隐藏
      setRightDialogVisible:false,
      // 所有权限的数据
      rightslist:[],
      // 树形控件的属性绑定对象
      treeProps:{
        label:'authName',
        children:'children'
      },
      // 默认选中的节点id值数组
      defkeys:[],
      // 当前即将分配权限的id
      roleId:''
    }
  },
  created(){
    this.getRolesList() 
  },
  methods:{
    //获取所有角色的列表
    async getRolesList(){
      const {data:res} = await this.$http.get('roles') 
      if(res.meta.status !== 200 ){
        return this.$message.error('获取角色列表失败')
      }  
      this.rolelist = res.data
      console.log(this.rolelist)
      
    },
    // 根据id 删除对应的权限 (同时可以 删除  一级 二级 三级 所有权限)
    async removeRightById(role,rightId){
      // 弹窗提示用户是否要删除 
      const confirmResult = await this.$confirm('此操作将永久删除该用户, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err);
     
        // 判断用户是否选择删除
        if(confirmResult !== 'confirm'){
            return this.$message.info('已取消删除');
        }
     
        // 发送删除请求
        const {data: res }= await this.$http.delete(`roles/${role.id}/rights/${rightId}`)

        if(res.meta.status !== 200){
          return this.$message.error('删除权限失败')
        }

        this.$message.success('删除权限成功')
        // 重新赋值  就不会刷新列表数据
        role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role){

      this.roleId = role.id
      // 获取所有权限的数据
      const {data: res} = await this.$http.get(`rights/tree`)

      if(res.meta.status !== 200 ){
        return this.$message.error('获取权限列表失败')
      } 
      // 获取到的权限数据
      this.rightslist = res.data  

      // 递归获取三级节点的id
      this.getLeafkeys(role,this.defkeys)
      this.setRightDialogVisible = true;
    },
    // 通过递归方式 获取角色下所有三级权限的id 并保存到  defkeys 数组中
    getLeafkeys(node,arr){
      // 如果当前node 节点不包含children 属性 则是三级节点
      if(!node.children){
        return arr.push(node.id)
      } 
      node.children.forEach(item=>this.getLeafkeys(item,arr)) 
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed(){ 
      this.defkeys = []
    },
    // 点击为角色分配权限
    async allotRights(){
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ] 
      const idStr = keys.join(',') 
      const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})

      if(res.meta.status !== 200 ){
        return this.$message.error('分配权限失败')
      }  
      this.$message.success('分配权限成功') 
      this.getRolesList() 
      this.setRightDialogVisible = false; 
    }
 
  }
}
</script>

<style scoped>
  .el-tag{
    margin: 7px; 
  }

  .bdtop{
    border-top: 1px solid #eee;
  }
  .bdbottom{
    border-bottom:1px solid #eee;
  }

  .vcenter{
    display: flex;
    align-items: center;
  } 
</style>